Chichibabin-Type Condensation of Cyclic Ketones with 3-R-1,2,4-triazin-5(4H)-ones

Reactions between substituted 1,2,4-triazines and ketones were investigated. General procedures for one-pot synthesis of hydrogenated derivatives of such polycyclic systems as benzo­[c]­[1,2,4]­triazino­[1,6-a]­[2]­azecine, [1,2,4]­triazino­[1,6-f]­phenantridine, and dicyclopenta­[b,d]­pyrido­[1,2-f]­[1,2,4]­triazine are described.